Motor-vehicle brake



' Feb. 2 1926; S. G. DOWN MOTOR VEHICLE BRAKE Filed March 11', 1924 luvahfro SIDNEYQDOWN W.

ATTORNEY Feb; 2, 192% earn SIDNEY G. DOWN, '0 PITTSBURGH PEN noose AIR BRAKE COMPANY, or

TION or PENNSYLVANIA.

NSYLVANIA, ASSIGNOR TO THE WESTING- WILMERDING. PENNSYLVANIA, A. CORPORA- MOTOR-VEHICLE BRAKE.

Application filed March 11, 1924. Serial No. 698,508.

To all whom it may concern: Be it known that I, SIDNEY G; DoWN,

- a citizen of the United States, residing at Pittsburgh, in the county of'All'eghcny and State of Pennsylvania, have invented new and useful Improvementsin Motor-Vehicle Brakes, of which the following is a specification.

This invention relates to brakes, and more particularly to a fluid pressure front wheel brake adapted for motor vehicles.

The principal object of my invention is' to provide an improved front wheel brake of the above type.

In the accompanying drawing; Fig. 1 is a side elevation of a front wheel brake construction embodying my invention; and Fig. 2 a central sectional View of the construction shown in Fig. 1. i

Int-he drawing, the reference numeral 1 indicates a front wheel of a motor vehicle which is supported by the usual steering knuchie 2, carried by the front axle 3. Secured to the wheel 1 is a brake drum 4 having an integral friction face 5 and'mounted in said drum are brake heads 6, having brake shoes 7 adapted to engage the friction face 5 of the drum.-

Accordingto my invention, a brake cham- 8 and a flanged cover plate 9 which are secured together to form the brake chamber with a flexible diaphragm 10 clamped between the flanges of the casing. and the cover.

plate. v

The chamber at one side of the diaphragm 10 is open to a pipe 11, through which fiuid under pressurc is suppliedto and released from the diaphragm. A pressure plate 12 engages the opposite side of the diaphragm 10 and secured tosaid The casing 8 is pivotally connected to a pair of links 14, which are pivotaliy connested to the free endsof the brake heads from the diaphragm 10,

cr is provided comprising a flanged casing plate is a push rod 13.

6. Connected to the rod 13 is a crosshc ad 15 and pivotally connected to said link is a pair of link-s16 which are aiso pivotally connected to the free ends of the brake heads 6.

When fluid under pressure is supplied through pipe 11 to. the' diaphragm 10, said diaphragm 1s moved outwardly relatively to the casing 8. 'A relative movement between the casing 8 and. the push rod 13 then takes place, so that the links 16 are operated by the movement of the push rod 13 while the links 14 are operated by the read tive movement. of the casing 8, toeffect a spreading of the ends of the brake heads 6. The spreading of the ends of the brake heads causes the brake shoes 7 to engage the friction face 5 of the brake drum 4. and thus an application of the brakes is effected.

.VVhen fluid is released through pipe 11 the springs 17 and 18 connected to the brake heads 6, operate to effect the movement of the brake heads to release position.

With the above described construction, the brake chamber is supported in position solely by its opera-ting connections to the brake heads'and that the brake chamber is containcd within the brake drum. so that a very I claim as new and desire to secure by Let ters Patent, is

In a vehicle brake, the combination with a brake drum and brake heads mounted in I said ,drum, of afluid pressure brake chambcr comprisinga casing, said joasinggto said bra'ire heads, a movable abutment in said brake chamber, a push rod operable by saidabutment, and links operatively connecting said push rod to said brake heads.

In testimony whereof I have hereunto set my hand. 7

SIDNEY G. DOWN.

links connecting 

